[chromium-reviews] Add getLanguage function to tabs extension

chrome/renderer/extensions/extension_api_client_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/extensions/extension_process_bindings.h"
@@ skipping 257 matching lines @@
                "Expected 'integer' but got 'string'.");
 
   ExpectJsFail("chrome.tabs.get(1, 1);",
                "Uncaught Error: Invalid value for argument 1. "
                "Expected 'function' but got 'integer'.");
 
   ExpectJsPass("chrome.tabs.get(2, function(){})",
                "GetTab", "2");
 }
 
+#if defined(OS_WIN)
+TEST_F(ExtensionAPIClientTest, GetTabLanguage) {
+  ExpectJsFail("chrome.tabs.getLanguage(32, function(){}, 20);",
+               "Uncaught Error: Too many arguments.");
+
+  ExpectJsFail("chrome.tabs.getLanguage('abc', function(){});",
+               "Uncaught Error: Invalid value for argument 0. "
+               "Expected 'integer' but got 'string'.");
+
+  ExpectJsFail("chrome.tabs.getLanguage(1, 1);",
+               "Uncaught Error: Invalid value for argument 1. "
+               "Expected 'function' but got 'integer'.");
+
+  ExpectJsPass("chrome.tabs.getLanguage(null, function(){})",
+               "GetTabLanguage", "null");
+}
+#endif
+
 TEST_F(ExtensionAPIClientTest, GetSelectedTab) {
   ExpectJsFail("chrome.tabs.getSelected(32, function(){}, 20);",
                "Uncaught Error: Too many arguments.");
 
   ExpectJsFail("chrome.tabs.getSelected(32);",
                "Uncaught Error: Parameter 1 is required.");
 
   ExpectJsFail("chrome.tabs.getSelected('abc', function(){});",
                "Uncaught Error: Invalid value for argument 0. "
                "Expected 'integer' but got 'string'.");
@@ skipping 205 matching lines @@
                "EnablePageAction",
                "[\"dummy\",{\"tabId\":0,\"url\":\"http://foo/\","
                            "\"title\":\"a\",\"iconId\":0}]");
 
   // Now try disablePageAction.
   ExpectJsPass("chrome.pageActions.disableForTab("
                "\"dummy\", {tabId: 0, url: \"http://foo/\"});",
                "DisablePageAction",
                "[\"dummy\",{\"tabId\":0,\"url\":\"http://foo/\"}]");
 }